D PLAN and S PLAN Apo objectives

MacroB · Post by **MacroB** » Tue Dec 20, 2016 9:50 am

Hello Everyone,

Have been using them for a while now but would appreciate if someone could explain what the D in D Plan objective and S in S Plan Apochromatic mean.

I did do a search and understand the PLAN and the Apo but could not find what the D and S stood for.

Best wishes for Christmas.
Bob

Alan Wood · Post by **Alan Wood** » Tue Dec 20, 2016 11:33 am

S indicates superwide, FN 26.5.

I don't know what D indicates.

http://www.alanwood.net/photography/oly ... tives.html

Alan Wood

MacroB · Post by **MacroB** » Thu Dec 22, 2016 8:36 am

Thanks Alan,

It's great to know where to find all that info you have put together on Olypus objectives.

Regards,
Bob